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Dimension Effect in Lattice Absorption of Silicon Carbide

机译:碳化硅晶格吸收的尺寸效应

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We report high-sensitive experimental investigations of the SiC powders transmission spectra in the lattice oscillations region. For the SiC powders with the grain size of the order of the wave length the transmission minimum is shifted to the low-frequency range with respect to the transverse oscillation frequency of a single crystal ω_T orresponding to phonon absorption with greater wave vectors. The decrease of the grain size leads to the shift and narrowing of the lattice absorption band to the high-frequency region. The observed change in the form and position of an absorption band corresponds to the narrowing of an optical phonon band due to decrease of the crystalline grain size, and approaching the lattice oscillation frequency to the frequency of molecular oscillations of Si-C in carbosilane owing to the surface energy contribution increase.
机译:我们报告在晶格振荡区域的SiC粉末透射光谱的高灵敏度实验研究。对于具有波长量级的晶粒尺寸的SiC粉末,相对于单晶ω_T的横向振荡频率或对应于较大波矢量的声子吸收,透射最小值移至低频范围。晶粒尺寸的减小导致晶格吸收带向高频区域的偏移和变窄。观察到的吸收带形式和位置的变化与由于晶体晶粒尺寸减小而导致的光学声子带变窄相对应,并且由于碳硅烷的存在,使晶格振荡频率接近Si-C的分子振荡频率。表面能的贡献增加。

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